Averillo was born in Sydney and played junior rugby league for Bankstown Sports and Moorebank Rams.

Averillo made his NRL debut in round 2 of the 2020 season for the Canterbury-Bankstown Bulldogs against the North Queensland Cowboys at ANZ Stadium.

[3][4] In round 14 of the 2021 NRL season Averillo scored two tries and kicked five goals as Canterbury–Bankstown defeated St. George Illawarra.

[8][9] In round 12 of the 2022 NRL season he scored two tries for Canterbury–Bankstown in their 34–24 loss against St. George Illawarra at Belmore Sports Ground.

[18] Averillo played a total of 23 matches for the Dolphins in the 2024 NRL season and scored eleven tries as the club finished 10th on the table.